That could definitely be the case. I often don't go online if I'm just taking a lap around and getting lottery rewards, because the Game Sync takes so long.I think you and/or those you're satisfying being offline contributes to why FC rewards seem lower than they should. I would advise making sure you go online at least once or twice a day and see if that helps.
If you could do that for me that'd be amazing, much appreciated. I can't get the Thump-Bump Park or Stomp-Stomp House through rank-up because they're Moon exclusive.I rank up in my Festival Plaza quite frequently and a lot of people on my VIP list have high Plaza ranks as well. If you'd like, I'll let you know if I stumble across any 5-star bouncy houses so you can get them.